Which expression represents the volume, in cubic units, of the composite figure?

7(52)(13) -
(52)(12)

(52(13) +7 (52)(25)

(52)(13) +
(52)(12)

(52)(13) -
(531(25)

Which expression represents the volume, in cubic units, of the composite figure?7(52)(13) -(52)(12)(

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Ответ:

01222002

14.01.2023

Mathematics

Number of books did Gillian buy is 11.

Step-by-step explanation:

Given : Gillian purchased 25 books at the library book sale. Each hardcover book cost $1.50, and each paperback book cost $0.50. Gillian spent a total of $26.50.

To find : How many paperback books did Gillian buy?

Solution :

The book costs can be represented by the system of equations below.

h+p= 25 ......(1)

1.50 h + 0.50 p = 26.50 ......(2)

Solving the system of equations by substitution method

Substitute h=25-p from (1) into (2)

1.50(25-p) + 0.50 p = 26.50

37.5-1.50p + 0.50 p = 26.50

p = 11

Substitute back in equation (1),

h+11= 25

h=14

i.e. there are 11 paperback books and 14 hardcover books.

Therefore, Number of books did Gillian buy is 11.

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Which expression represents the volume, in cubic units, of the composite figure?7(52)(13) -(52)(12)(52(13) +7 (52)(25)(52)(13) +(52)(12)(52)(13) -(531(25)